ISO 17076-1-2020 pdf download.Leather- Determination of abrasion resistance一 Part 1: TaberR method.
This document specifies a method of determining the abrasion resistance of leather using a Taber® apparatus.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 105-A02, Textiles — Tests for colourfastness — Part A02: Grey scale for assessing change in colour
ISO 2418, Leather — Chemical, physical and mechanical and fastness tests — Sampling location
ISO 2419, Leather — Physical and mechanical tests — Sample preparation and conditioning
ISO 6103, Bonded abrasive products — Permissible unbalances of grinding wheels as delivered — Static testing
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— I EC Electropedia: available at http://www.electropedia.org/
4 Principle
The test piece is rotated on a vertical axis against the sliding rotation of two abrading wheels which are pressed against the test piece with a specified force. One abrading wheel rubs the test piece outwards towards the periphery, the other inwards to the centre. Any damage to the test piece is noted along with any change in colour.
NOTE This method is also referred to as the Taber tesC.
5 Apparatus
5.1 Horizontal, motor-driven platform, rotating at (60 ± 5) rpm.
5.2 Removable, flat, circular test piece holder.
5.3 PaIr of pivoted arms, for holding the abrasive wheels with the inner edge of the wheels (26,2 ± 0,5) mm from the centre of the motor shaft and pressing each abrasive wheel against the test piece with a force of(2,5 ± 0,1) N.
The arms should preferably be designed so that, without any counterweights or additional masses, each would exert a force of 2,5 N on the abrasive wheel.
5.4 Vacuum nozzle, with inlet set approximately 7 mm above the upper surface of the test piece.
5.5 Counter, indicating the number of revolutions of the platform (&I).
5.6 Abrasive wheels, tungsten carbide (“S” series, e.g. S-35” see Annex A), rubber-based (“CS” series, e.g. “CS-10” see Annex A) or silicon carbide (“H” series, e.g. NH.22, see Annex A), width (12,7 ± 0,1) mm, maximum diameter 51,7 mm and minimum diameter 44,0 mm. Abrasive wheels are gradually abraded away during use. The maximum diameter of 51,7 mm is the diameter of a new wheel. Used wheels shall be discarded when the diameter falls to 44,0 mm. The type of abrasive wheels to be used should be agreed with the client and the type of wheel used reported in the test report 18 c)]. Other types of abrasive wheels can also be used at the client’s request. The abrasive wheels used in the test should be of the same diameter.
5.7 Additional weights, to increase the force between the abrasive wheel and the test piece to
(4,9 ± 0,2) N or (9,8 ± 0,4) N.
5.8 Specimen mounting sheet, such as a card of minimum 1,0 mm thickness, with an adhesive where necessaiy to keep the test pieces rigid and flat.
5.9 Vacuum cleaner, with an adapter to connect to the nozzle (&4).
5.10 Abrasive paper, silicon carbide, grade 150, for example E150 (FEPA standard) or Cami 150 grit.
5.11 Soft brush or compressed air.
5.12 Brush, stiff bristle.
5.13 Grey scale, for assessing change in colour conforming to ISO 105-A02.
5.14 Magnifier with fourfold to sixfold magnification, for visual evaluation of the friction track.
5.15 Suitable apparatus for preparation and reconditioning of the rubber-based and silicon carbide abrasive wheels and ensuring that the re-faced wheel is within the permissible unbalances of grinding wheels specified in ISO 6103, and that there is full surface and perpendicular contact with the test pieces. A diamond re-facing tool is required for preparing silicon carbide abrasive wheels (Annex A).
6 Sampling and sample preparation
6.1 Sample in accordance with ISO 2418.
If there are more than two hides or skins to be tested In one batch then only one sample needs be taken from each hide or skin, provided that the overall total is not less than three test pieces.
6.2 Apply the specimen mounting sheet (i1) to the sample, If required. Cut three circular test pieces of diameter (106 ± 1) mm with a central circular hole to fit over the central drive shaft.ISO 17076-1 pdf download.